Are you able to customize soldiers/scientists/engineers from the living quarter screen?
It seems that only way how to customize soldiers are from the pre-mission screen but there is no way how to customize scientists/engineers?
Edited: It seems that it's possible to customize soldiers from Armory screen where is also located View solders menu item. But the same doesn't work for scientists/engineers from Research or Engineering screen.
Best Answer
No, you can't. The only thing you can do in the Living Quarters screen is to view what soldiers you have, the scientists you have, and the engineers you have.
The only way to customize your soldiers is, like you said, either from the Armory or in the mission deploy screen. You can't customize engineers and scientists.